Abstract
In [13,16,19,22,25,28,42,45,48,51,54,57-dodecaoxahexaheptacyclo[28.28.1.111,40.05,58.07,12.029,34.036,41]hexaconta-1(58),2,4,7,9,11,29,31,33,36,38,40-dodecaene-1κ6O; 2κ6O]bis(iodocaesium) bis(acetonitrile) solvate, [Cs2I2(C48H60O12)].2CH3CN, the calix[4]arene macrocycle, fixed in the 1,3-alternate conformation by two bridging –(OCH2CH2)5O– units (denoted 1,3-calix[4]-bis-crown-6) forms a binuclear complex with caesium iodide. The two Cs+ ions are located at the centre of the coordination site defined by the six O atoms of a crown-ether chain and are bonded to six O atoms and iodide counterions; they also interact with the two closest benzene rings. This complex is isostructural with the previously reported structures of `free' 1,3-calix[4]bis-crown-6 and some of its complexes with caesium or potassium nitrate.
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